They were purchased three months ago. They were connected to an old mini hi-fi SAMSUNG 20W. They replaced the old speakers that were damaged. The sound is full with good bass and pronounced highs. It takes time for them to settle. More than a month. I use CDs and mp3 files at 320 kbps with improved sound using audacity software. The result satisfied me. Honest speakers for their price

Good value passive speakers. At 4OHM, they can be connected to almost anything. Let's say you have a decent 2.1 system on your computer. The subwoofer is good, but the satellites are weak. Take them out and replace them with two of these. Profit :)
They seem to struggle around 60Hz and below, but above that, they perform well. The tweeters they have are also very good. One of these could be the ideal center speaker for your 5.1/7.1 system that you were looking for. As long as the driver is at 4OHM, there is no issue. If you use them with a 6 or 8 OHM driver, there is a possibility of damage. Apart from that, they also work with battery-powered radios (okay, they won't deliver 60 watts there, lol)

They were installed as main speakers in an old five-channel entry-level Compact Home Cinema amplifier ProLogic/DTS/DD, by Samsung, to upgrade the plastic speakers it had before, which were creaking and never produced proper sound. The result is amazing, both for movies and music. Full, clear, and pleasant sound. Very good construction, beautiful, with quality connection ports for both bare wire and banana plugs. They were combined with the Nobsound NS-60C center speaker. Very satisfied.

I tried it peripherally first and then I put it centrally (one of the 5 I had burned). Compared to the crystal audio ones I have, the peripheral sound is weak and distorts at the same intensity as the old ones, but as a central (dialogues) it is better and clearer. They are worth their money.